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About Joan Langdon
- Joan Marjorie Langdon (born December 2, 1922), also known by her married name Joan McLagan, is a Canadian female former competition swimmer and breaststroker who competed in the 1936 Summer Olympics in Berlin, Germany.
- At the age of 13, she competed in the first round of the 200-metre breaststroke, but did not advance. At the 1938 British Empire Games in Sydney, she won the bronze medal in the 220-yard breaststroke competition.
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